The modern textile company TINTEX is located in Villa Nova, not far from the Spanish border in northern Portugal. The company was founded in 1998 in the region of Porto. The product range includes functional tricot fabrics for well-known fashion, sports and lingerie brands. TINTEX is convinced that fashion can truly make a difference in tackling climate change. That is why their engineers are constantly developing new strategies and environmentally friendly concepts throughout the whole production process. The technologists' expertise covers the entire textile supply chain, including dyeing and finishing techniques as well as coatings.
„No sustainability without innovation.“
True to this motto, TINTEX is constantly researching for fabric innovations to develop and produce intelligent, functional and high-performance textiles. To round off the concept, a few years ago it was decided to cooperate with the German textile machinery manufacturer BRÜCKNER.
Knitted Fabric Are Directly Coated
The vision of TINTEX was to be able to achieve completely new effects on bi-elastic knitwear and to produce fabrics that did not even exist before. This was followed by numerous tests in the Technology Centre at BRÜCKNER in Leonberg and on a BRÜCKNER line in an institute for textile and process engineering near Stuttgart. So a new, revolutionary line concept was worked out together, which has unbeatable benefits especially with regard to the requirements of temperature uniformity, the thermal treatment of synthetic fibre blends and other constructive issues. Even very difficult knitted fabric with high elastane content can now be directly coated or functionalized. Until now, such coatings were only possible in an indirect coating process.
Power-Frame Dryer
The heart of the new line is the proven, but constantly further developed and optimized POWER-FRAME stenter frame dryer. The inlet and outlet components are specially designed for sensitive fabric and ensure a tensionless fabric run. A special, newly developed coating unit is integrated in the infeed stand of the stenter frame. Due to its variable design, two different application processes are possible on the same line. In the so-called screen coating process, water-based pastes and stable or unstable foams are applied onto the fabric with high precision by means of a driven, cylindrical screen and a squeegee system integrated in the screen.
Energy Savings
For paste coating, the machine parameters can be adjusted in such a way that a single-side coating is possible even on light knitwear made of cotton or viscose, provided the paste is of a suitable viscosity. For the stable foam coating, the coating medium is mixed to foam with an exact foam/liter weight of 150 to 300 g/l. With an integrated feed pump, this foam can be precisely dosed and applied to the tex-tile through the screen. Also in the case of unstable foam coating, the coating medium is foamed up with a mixer and applied to the textile in exact doses. Here the foam/liter weight is 30 to 100 g/l. As the unstable foam collapses shortly after leaving the screen, a single-side functionalization with a very low pick-up of less than 10-20 % can be achieved. This is a minimum application with the corres-ponding benefits, e.g. considerable energy and thus cost savings in the subsequent drying process. If you want to coat somewhat more stable fabric or apply higher coating weights, the unit can be quickly and easily converted from screen coating to a knife-over-cylinder system. The counter pressure roller is then used as coating cylinder.
A laminating/embossing calender integrated in the outfeed of the stenter allows various effects to be achieved on the fabric, e.g. a leather grain. If the applied stable foam coating has a certain layer thickness, this effect can be achieved after the drying passage in the laminating calender by means of a fed release paper or an appropriate embossing roller. Even with sensitive, directly coated knitted fabric, this calender can be used to apply e.g. a film, a membrane or a second textile web onto the fabric. For this purpose, the calender is additionally equipped with an electric short-wave infrared dryer.
For simple heat-setting processes a special roller has been developed which can be inserted into the coating unit instead of the screen and thus acts as the upper infeed roller. Even very tension-sensitive knitwear can be run with an overfeed of up to 60 % before heat-setting.
This new multifunctional line can therefore be used for heat-setting, drying and coating processes. It can be used to manufacture products comparable to those previously produced with indirect coating - but without having to rely on cost-intensive release paper. At TINTEX in Portugal, production on this line has already been running for some time and research into completely new types of textiles is continuing. At Munich Fabric Start, TINTEX even won the Hightex Award with such newly developed pro-ducts, as well as the Innovation Award at Techtextil in Frankfurt.
